Sensor exhaust emissions scout in Bosch post-processing system

In recent years, the country has gradually increased its exhaust emission requirements for commercial vehicles. As the leading technology brand for fuel systems and exhaust emission treatment systems, Bosch is widely used by domestic OEMs. However, all the functions of post-processing from fuel mixing to exhaust gas still rely on precise, real-time signals from the exhaust system. For this reason, Bosch specifically develops corresponding sensors for the control of exhaust gas after-treatment, which is used to monitor the emissions of exhaust gases so that the discharged gases meet the national emission standards.

Bosch

Bosch's gas emissions from fuel combustion are separately monitored by different sensors. Fuel mixing is controlled by the diesel electronic control unit and is an important factor in reducing the original engine emissions. The Bosch Oxygen Sensor can effectively reduce the original emissions by measuring the oxygen concentration in the exhaust gas.

Sensors in tail gas aftertreatment systems

At the same time, Bosch offers solutions for closed particle traps. When the particle trap is at full load, all stored pellets need to be burned and regenerated. This solution uses a differential pressure sensor to monitor the load condition of D and at the same time realizes regeneration of the DPF by identifying the sensor signal in the software.

Application of Sensor in Diesel Exhaust System

As the requirements of emission regulations are further increased, more additional sensors will be needed, including nitrogen and oxygen concentration sensors, exhaust gas particle sensors, differential pressure sensors, and the like.

NOx sensor

The NOx sensor is used to control the urea injection quantity of the SCR system, thereby reducing NOx emissions and achieving OBD monitoring of the SCR component. The ceramic sensor unit of the sensor is a technology that uses two ion chambers to measure the NOx concentration in the exhaust gas. It is suitable for passenger car and commercial vehicle applications.

Tail gas particle sensor

The exhaust particle sensor is used to diagnose the particle trap, which is installed downstream of the exhaust trap's particle trap. The sensor uses a resistance measurement method: When the particles in the tail gas are attached between the two electrodes, a conductive loop is formed, which generates current. The sensing unit is regenerated by heating. The diagnostic function of the software feeds back the DPF's particle load by measuring the current and is suitable for passenger car and commercial vehicle applications.

Differential pressure sensor

The differential pressure sensor uses a varistor unit to measure the pressure difference across the particle trap. The measured value is used to calculate the load condition of the particulate trap, so as to realize the control of particle trap regeneration and energy conservation and emission reduction.

Oxygen sensor for diesel engine

The wide-area oxygen sensor is used to measure the oxygen concentration in the exhaust system and to help achieve emissions and OBD regulatory requirements. The heart of the sensor is a wide-area sensing unit that integrates measurement and heating functions. The measured data is fed back to the intake system to adjust the optimal gas-oil mixing. The latest generation of oxygen sensors is specifically designed based on the characteristics of diesel engines based on customer requirements.

It is understood that the next phase of emission regulations in the United States and the European Union will stipulate the diagnosis of a comprehensive tail gas aftertreatment system to ensure that the vehicle meets the emission targets during its life cycle. The precise signals provided by Bosch sensors on the one hand can make the combustion of the engine more economical and clean. In addition, it can help to meet the current emission standards and OBD (vehicle fault diagnosis) regulations, and it will also provide greater benefits for Euro 5, Euro VI and CARB ≥ MY2013. s help.

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